amplo, brevi. Long. | ; lat. \ poll. Found on a coral ledge, Cler- 

 mont Tonnerre, Paumotu Islands. 

 Very much like N. lurida. 



Lottia onychina. T. deformis, tenuis, depressa, rotundato- 

 ovata, costis obsoletis radiantibus ad 20, et gradibus incrementi con- 

 fertis laxis notata ; apice subcentrali, eroso : extus cinerea, inter- 

 spatiis costarum plerumque fuseo-olivaceis : intus lutea eastaneo 

 variegata; margine acuto, irregulari. Long. -| ; lat. 1 ; alt. l poll. 

 Probably from the coast of Peru, though marked Rio Janeiro. 



They resemble depressed specimens of L. scabra. 



Rimula [Puncturella] cognata. T. conica, alba, radiatim costu- 

 lata; apice incurvato: apertura rotundato-ovalis. Dredged in 16 

 fathoms water, Orange Harbor. Coutliouy. 



Similar to R. conica, D'Orb., but less elevated, and the ribs more 

 regular. 



Captjlus sagittifer. T. parva, tenuis, lucida, Candida, semi- 

 globosa, apice mediano, dextrorsum inclinato, acuto : extus lineis 

 lacteis radiantibus, papillas sagittatas gerentibus insculpta : apertura 

 sub-circularis : cavositas profunda ; cicatricibus bend impressis et 

 septo filiformi junctis. Diam. 1 ; alt. -^ poll. Habitat uncertain. 



Well distinguished by its radiating lines, made up of chains of 

 arrow-heads. 



Peronia irrorata. Corpus elongato-ovale, convexum, flavo et 

 olivaceo nubeculatum, granulis confertis instructum, marginibus 

 dilatatis, phcis radiantibus ad decern quasi denticulatis : caput pro- 

 tractum, lateraliter dilatatum, cceruleum ; tentacidis curtis, gracilibus, 

 capitatis, coeruleis : solea trientem latitudinis corporis adequans. 

 Long. 1 ; lat. £ ; alt. \ poll. In tide-pools, Bay of Islands, New Zea- 

 land. Drayton. 



May be compared with P. patelloidea, but differing in color, form, 

 marginal projections, &c. [Genus Onchidella; also two next species.] 



Peronia acixosa. Corpus elongatum, sub-cylindraeeum, postice 

 angustatum, ad extremitates rotundatum, papillis beryllinis ornatum : 

 solea cbmidiam longitudinis corporis adequans, fusco-violacea ; tenta- 

 cular cyanear. Long. l£ ; lat. | poll. Inhabits Feejee Islands. 



Remarkable for its mulberry-like surface and amethystine color. 



Peronia corpulexta. Corpus linguiforme, convexum, supra 

 cyaneum, infra olivaceum, tuberculis magnis elevatis rotundatis 

 (minoribus circumjacentibus) instructum ; veli marginibus undulatis ; 

 cucullo cordato ; tentaculis elongatis, linearibus, viridibus : solea pal- 

 lida J- longitudinis corporis adequans. Long. 2^ ; lat. X ; alt. £ poll. 

 Found at Direction Island, one of the Feejees. 



